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Employee Benefit Plans - Estimated Future Benefit Payments (Details) | 12 Months Ended
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Dec. 31, 2018 USD ($)
Non-qualified pension plans |
Employee benefit plans |
Employer contributions | $ 6,200,000
Expected minimum required funding contributions in 2019 | 5,800,000
Postretirement Plans |
Estimated future benefit payments, net of subsidies: |
2019 | 8,500,000
2020 | 7,800,000
2021 | 7,100,000
2022 | 6,400,000
2023 | 5,800,000
Subsequent five years | 22,100,000
United States |
Employee benefit plans |
Employer contributions | 0
Estimated future benefit payments, net of subsidies: |
2019 | 24,100,000
2020 | 23,600,000
2021 | 23,300,000
2022 | 24,800,000
2023 | 24,500,000
Subsequent five years | 108,600,000
Foreign Plan |
Employee benefit plans |
Employer contributions | 1,100,000
Expected minimum required funding contributions in 2019 | 1,000,000
Estimated future benefit payments, net of subsidies: |
2019 | 5,100,000
2020 | 5,000,000
2021 | 5,100,000
2022 | 6,000,000
2023 | 6,000,000
Subsequent five years | $ 35,000,000

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